//--------------------------------------------------------------------------------------
// File: Camera.h
//
// Helper functions for Direct3D programming.
//
// Copyright (c) Microsoft Corporation. All rights reserved
//--------------------------------------------------------------------------------------
#pragma once
#ifndef CAMERA_H
#define CAMERA_H

//--------------------------------------------------------------------------------------
class CD3DArcBall
{
public:
    CD3DArcBall();

    // Functions to change behavior
    void Reset(); 
    void SetTranslationRadius( FLOAT fRadiusTranslation ) { m_fRadiusTranslation = fRadiusTranslation; }
    void SetWindow( INT nWidth, INT nHeight, FLOAT fRadius = 0.9f ) { m_nWidth = nWidth; m_nHeight = nHeight; m_fRadius = fRadius; m_vCenter = D3DXVECTOR2(m_nWidth/2.0f,m_nHeight/2.0f); }
    void SetOffset( INT nX, INT nY ) { m_Offset.x = nX; m_Offset.y = nY; }

    // Call these from client and use GetRotationMatrix() to read new rotation matrix
    void OnBegin( int nX, int nY );  // start the rotation (pass current mouse position)
    void OnMove( int nX, int nY );   // continue the rotation (pass current mouse position)
    void OnEnd();                    // end the rotation 

    // Or call this to automatically handle left, middle, right buttons
    LRESULT     HandleMessages( HWND hWnd, UINT uMsg, WPARAM wParam, LPARAM lParam );

    // Functions to get/set state
    const D3DXMATRIX* GetRotationMatrix()                   { return D3DXMatrixRotationQuaternion(&m_mRotation, &m_qNow); };
    const D3DXMATRIX* GetTranslationMatrix() const          { return &m_mTranslation; }
    const D3DXMATRIX* GetTranslationDeltaMatrix() const     { return &m_mTranslationDelta; }
    bool        IsBeingDragged() const                      { return m_bDrag; }
    D3DXQUATERNION GetQuatNow() const                       { return m_qNow; }
    void        SetQuatNow( D3DXQUATERNION q ) { m_qNow = q; }

    static D3DXQUATERNION WINAPI QuatFromBallPoints( const D3DXVECTOR3 &vFrom, const D3DXVECTOR3 &vTo );


protected:
    D3DXMATRIXA16  m_mRotation;         // Matrix for arc ball's orientation
    D3DXMATRIXA16  m_mTranslation;      // Matrix for arc ball's position
    D3DXMATRIXA16  m_mTranslationDelta; // Matrix for arc ball's position

    POINT          m_Offset;   // window offset, or upper-left corner of window
    INT            m_nWidth;   // arc ball's window width
    INT            m_nHeight;  // arc ball's window height
    D3DXVECTOR2    m_vCenter;  // center of arc ball 
    FLOAT          m_fRadius;  // arc ball's radius in screen coords
    FLOAT          m_fRadiusTranslation; // arc ball's radius for translating the target

    D3DXQUATERNION m_qDown;             // Quaternion before button down
    D3DXQUATERNION m_qNow;              // Composite quaternion for current drag
    bool           m_bDrag;             // Whether user is dragging arc ball

    POINT          m_ptLastMouse;      // position of last mouse point
    D3DXVECTOR3    m_vDownPt;           // starting point of rotation arc
    D3DXVECTOR3    m_vCurrentPt;        // current point of rotation arc

    D3DXVECTOR3    ScreenToVector( float fScreenPtX, float fScreenPtY );
};


//--------------------------------------------------------------------------------------
// used by CCamera to map WM_KEYDOWN keys
//--------------------------------------------------------------------------------------
enum D3DUtil_CameraKeys
{
    CAM_STRAFE_LEFT = 0,
    CAM_STRAFE_RIGHT,
    CAM_MOVE_FORWARD,
    CAM_MOVE_BACKWARD,
    CAM_MOVE_UP,
    CAM_MOVE_DOWN,
    CAM_RESET,
    CAM_CONTROLDOWN,
    CAM_MAX_KEYS,
    CAM_UNKNOWN = 0xFF
};

#define KEY_WAS_DOWN_MASK 0x80
#define KEY_IS_DOWN_MASK  0x01

#define MOUSE_LEFT_BUTTON   0x01
#define MOUSE_MIDDLE_BUTTON 0x02
#define MOUSE_RIGHT_BUTTON  0x04
#define MOUSE_WHEEL         0x08


//--------------------------------------------------------------------------------------
// Simple base camera class that moves and rotates.  The base class
//       records mouse and keyboard input for use by a derived class, and 
//       keeps common state.
//--------------------------------------------------------------------------------------
class CBaseCamera
{
public:
    CBaseCamera();

    // Call these from client and use Get*Matrix() to read new matrices
    virtual LRESULT HandleMessages( HWND hWnd, UINT uMsg, WPARAM wParam, LPARAM lParam );
    virtual void    FrameMove( FLOAT fElapsedTime ) = 0;

    // Functions to change camera matrices
    virtual void Reset(); 
    virtual void SetViewParams( D3DXVECTOR3* pvEyePt, D3DXVECTOR3* pvLookatPt );
    virtual void SetProjParams( FLOAT fFOV, FLOAT fAspect, FLOAT fNearPlane, FLOAT fFarPlane );

    // Functions to change behavior
    virtual void SetDragRect( RECT &rc ) { m_rcDrag = rc; }
    void SetInvertPitch( bool bInvertPitch ) { m_bInvertPitch = bInvertPitch; }
    void SetDrag( bool bMovementDrag, FLOAT fTotalDragTimeToZero = 0.25f ) { m_bMovementDrag = bMovementDrag; m_fTotalDragTimeToZero = fTotalDragTimeToZero; }
    void SetEnableYAxisMovement( bool bEnableYAxisMovement ) { m_bEnableYAxisMovement = bEnableYAxisMovement; }
    void SetEnablePositionMovement( bool bEnablePositionMovement ) { m_bEnablePositionMovement = bEnablePositionMovement; }
    void SetClipToBoundary( bool bClipToBoundary, D3DXVECTOR3* pvMinBoundary, D3DXVECTOR3* pvMaxBoundary ) { m_bClipToBoundary = bClipToBoundary; if( pvMinBoundary ) m_vMinBoundary = *pvMinBoundary; if( pvMaxBoundary ) m_vMaxBoundary = *pvMaxBoundary; }
    void SetScalers( FLOAT fRotationScaler = 0.01f, FLOAT fMoveScaler = 5.0f )  { m_fRotationScaler = fRotationScaler; m_fMoveScaler = fMoveScaler; }
    void SetNumberOfFramesToSmoothMouseData( int nFrames ) { if( nFrames > 0 ) m_fFramesToSmoothMouseData = (float)nFrames; }
    void SetResetCursorAfterMove( bool bResetCursorAfterMove ) { m_bResetCursorAfterMove = bResetCursorAfterMove; }

    // Functions to get state
    const D3DXMATRIX*  GetViewMatrix() const { return &m_mView; }
    const D3DXMATRIX*  GetProjMatrix() const { return &m_mProj; }
    const D3DXVECTOR3* GetEyePt() const      { return &m_vEye; }
    const D3DXVECTOR3* GetLookAtPt() const   { return &m_vLookAt; }
    float GetNearClip() const { return m_fNearPlane; }
    float GetFarClip() const { return m_fFarPlane; }

    bool IsBeingDragged() const         { return (m_bMouseLButtonDown || m_bMouseMButtonDown || m_bMouseRButtonDown); }
    bool IsMouseLButtonDown() const     { return m_bMouseLButtonDown; } 
    bool IsMouseMButtonDown() const     { return m_bMouseMButtonDown; } 
    bool IsMouseRButtonDown() const     { return m_bMouseRButtonDown; } 

protected:
    // Functions to map a WM_KEYDOWN key to a D3DUtil_CameraKeys enum
    virtual D3DUtil_CameraKeys MapKey( UINT nKey );    
    bool IsKeyDown( BYTE key ) const { return( (key & KEY_IS_DOWN_MASK) == KEY_IS_DOWN_MASK ); }
    bool WasKeyDown( BYTE key ) const { return( (key & KEY_WAS_DOWN_MASK) == KEY_WAS_DOWN_MASK ); }

    void ConstrainToBoundary( D3DXVECTOR3* pV );
    void UpdateMouseDelta();
    void UpdateVelocity( float fElapsedTime );
    void GetInput( bool bGetKeyboardInput, bool bGetMouseInput, bool bGetGamepadInput, bool bResetCursorAfterMove );

    D3DXMATRIX            m_mView;              // View matrix 
    D3DXMATRIX            m_mProj;              // Projection matrix

    DXUT_GAMEPAD          m_GamePad[DXUT_MAX_CONTROLLERS];  // XInput controller state
    D3DXVECTOR3           m_vGamePadLeftThumb;
    D3DXVECTOR3           m_vGamePadRightThumb;
    double                m_GamePadLastActive[DXUT_MAX_CONTROLLERS];

    int                   m_cKeysDown;            // Number of camera keys that are down.
    BYTE                  m_aKeys[CAM_MAX_KEYS];  // State of input - KEY_WAS_DOWN_MASK|KEY_IS_DOWN_MASK
    D3DXVECTOR3           m_vKeyboardDirection;   // Direction vector of keyboard input
    POINT                 m_ptLastMousePosition;  // Last absolute position of mouse cursor
    bool                  m_bMouseLButtonDown;    // True if left button is down 
    bool                  m_bMouseMButtonDown;    // True if middle button is down 
    bool                  m_bMouseRButtonDown;    // True if right button is down 
    int                   m_nCurrentButtonMask;   // mask of which buttons are down
    int                   m_nMouseWheelDelta;     // Amount of middle wheel scroll (+/-) 
    D3DXVECTOR2           m_vMouseDelta;          // Mouse relative delta smoothed over a few frames
    float                 m_fFramesToSmoothMouseData; // Number of frames to smooth mouse data over

    D3DXVECTOR3           m_vDefaultEye;          // Default camera eye position
    D3DXVECTOR3           m_vDefaultLookAt;       // Default LookAt position
    D3DXVECTOR3           m_vEye;                 // Camera eye position
    D3DXVECTOR3           m_vLookAt;              // LookAt position
    float                 m_fCameraYawAngle;      // Yaw angle of camera
    float                 m_fCameraPitchAngle;    // Pitch angle of camera

    RECT                  m_rcDrag;               // Rectangle within which a drag can be initiated.
    D3DXVECTOR3           m_vVelocity;            // Velocity of camera
    bool                  m_bMovementDrag;        // If true, then camera movement will slow to a stop otherwise movement is instant
    D3DXVECTOR3           m_vVelocityDrag;        // Velocity drag force
    FLOAT                 m_fDragTimer;           // Countdown timer to apply drag
    FLOAT                 m_fTotalDragTimeToZero; // Time it takes for velocity to go from full to 0
    D3DXVECTOR2           m_vRotVelocity;         // Velocity of camera

    float                 m_fFOV;                 // Field of view
    float                 m_fAspect;              // Aspect ratio
    float                 m_fNearPlane;           // Near plane
    float                 m_fFarPlane;            // Far plane

    float                 m_fRotationScaler;      // Scaler for rotation
    float                 m_fMoveScaler;          // Scaler for movement

    bool                  m_bInvertPitch;         // Invert the pitch axis
    bool                  m_bEnablePositionMovement; // If true, then the user can translate the camera/model 
    bool                  m_bEnableYAxisMovement; // If true, then camera can move in the y-axis

    bool                  m_bClipToBoundary;      // If true, then the camera will be clipped to the boundary
    D3DXVECTOR3           m_vMinBoundary;         // Min point in clip boundary
    D3DXVECTOR3           m_vMaxBoundary;         // Max point in clip boundary

    bool                  m_bResetCursorAfterMove;// If true, the class will reset the cursor position so that the cursor always has space to move 
};


//--------------------------------------------------------------------------------------
// Simple first person camera class that moves and rotates.
//       It allows yaw and pitch but not roll.  It uses WM_KEYDOWN and 
//       GetCursorPos() to respond to keyboard and mouse input and updates the 
//       view matrix based on input.  
//--------------------------------------------------------------------------------------
class CFirstPersonCamera : public CBaseCamera
{
public:
    CFirstPersonCamera();

    // Call these from client and use Get*Matrix() to read new matrices
    virtual void FrameMove( FLOAT fElapsedTime );

    // Functions to change behavior
    void SetRotateButtons( bool bLeft, bool bMiddle, bool bRight, bool bRotateWithoutButtonDown = false );

    // Functions to get state
    D3DXMATRIX*  GetWorldMatrix()            { return &m_mCameraWorld; }

    const D3DXVECTOR3* GetWorldRight() const { return (D3DXVECTOR3*)&m_mCameraWorld._11; } 
    const D3DXVECTOR3* GetWorldUp() const    { return (D3DXVECTOR3*)&m_mCameraWorld._21; }
    const D3DXVECTOR3* GetWorldAhead() const { return (D3DXVECTOR3*)&m_mCameraWorld._31; }
    const D3DXVECTOR3* GetEyePt() const      { return (D3DXVECTOR3*)&m_mCameraWorld._41; }

protected:
    D3DXMATRIX m_mCameraWorld;       // World matrix of the camera (inverse of the view matrix)

    int        m_nActiveButtonMask;  // Mask to determine which button to enable for rotation
    bool       m_bRotateWithoutButtonDown;
};


//--------------------------------------------------------------------------------------
// Simple model viewing camera class that rotates around the object.
//--------------------------------------------------------------------------------------
class CModelViewerCamera : public CBaseCamera
{
public:
    CModelViewerCamera();

    // Call these from client and use Get*Matrix() to read new matrices
    virtual LRESULT HandleMessages( HWND hWnd, UINT uMsg, WPARAM wParam, LPARAM lParam );
    virtual void FrameMove( FLOAT fElapsedTime );

   
    // Functions to change behavior
    virtual void SetDragRect( RECT &rc );
    void Reset(); 
    void SetViewParams( D3DXVECTOR3* pvEyePt, D3DXVECTOR3* pvLookatPt );
    void SetButtonMasks( int nRotateModelButtonMask = MOUSE_LEFT_BUTTON, int nZoomButtonMask = MOUSE_WHEEL, int nRotateCameraButtonMask = MOUSE_RIGHT_BUTTON ) { m_nRotateModelButtonMask = nRotateModelButtonMask, m_nZoomButtonMask = nZoomButtonMask; m_nRotateCameraButtonMask = nRotateCameraButtonMask; }
    void SetAttachCameraToModel( bool bEnable = false ) { m_bAttachCameraToModel = bEnable; }
    void SetWindow( int nWidth, int nHeight, float fArcballRadius=0.9f ) { m_WorldArcBall.SetWindow( nWidth, nHeight, fArcballRadius ); m_ViewArcBall.SetWindow( nWidth, nHeight, fArcballRadius ); }
    void SetRadius( float fDefaultRadius=5.0f, float fMinRadius=1.0f, float fMaxRadius=FLT_MAX  ) { m_fDefaultRadius = m_fRadius = fDefaultRadius; m_fMinRadius = fMinRadius; m_fMaxRadius = fMaxRadius; m_bDragSinceLastUpdate = true; }
    void SetModelCenter( D3DXVECTOR3 vModelCenter ) { m_vModelCenter = vModelCenter; }
    void SetLimitPitch( bool bLimitPitch ) { m_bLimitPitch = bLimitPitch; }
    void SetViewQuat( D3DXQUATERNION q ) { m_ViewArcBall.SetQuatNow( q ); m_bDragSinceLastUpdate = true; }
    void SetWorldQuat( D3DXQUATERNION q ) { m_WorldArcBall.SetQuatNow( q ); m_bDragSinceLastUpdate = true; }

    // Functions to get state
    const D3DXMATRIX* GetWorldMatrix() const { return &m_mWorld; }
    void SetWorldMatrix( D3DXMATRIX &mWorld ) { m_mWorld = mWorld; m_bDragSinceLastUpdate = true; }

protected:
    CD3DArcBall  m_WorldArcBall;
    CD3DArcBall  m_ViewArcBall;
    D3DXVECTOR3  m_vModelCenter;
    D3DXMATRIX   m_mModelLastRot;        // Last arcball rotation matrix for model 
    D3DXMATRIX   m_mModelRot;            // Rotation matrix of model
    D3DXMATRIX   m_mWorld;               // World matrix of model

    int          m_nRotateModelButtonMask;
    int          m_nZoomButtonMask;
    int          m_nRotateCameraButtonMask;

    bool         m_bAttachCameraToModel;
    bool         m_bLimitPitch;
    float        m_fRadius;              // Distance from the camera to model 
    float        m_fDefaultRadius;       // Distance from the camera to model 
    float        m_fMinRadius;           // Min radius
    float        m_fMaxRadius;           // Max radius
    bool         m_bDragSinceLastUpdate; // True if mouse drag has happened since last time FrameMove is called.

    D3DXMATRIX   m_mCameraRotLast;

};

//--------------------------------------------------------------------------------------
// Manages the mesh, direction, mouse events of a directional arrow that 
// rotates around a radius controlled by an arcball 
//--------------------------------------------------------------------------------------
class CDXUTDirectionWidget
{
public:
    CDXUTDirectionWidget();

    static HRESULT WINAPI StaticOnD3D9CreateDevice( IDirect3DDevice9* pd3dDevice );
    HRESULT OnD3D9ResetDevice( const D3DSURFACE_DESC* pBackBufferSurfaceDesc );
    HRESULT OnRender9( D3DXCOLOR color, const D3DXMATRIX* pmView, const D3DXMATRIX* pmProj, const D3DXVECTOR3* pEyePt );
    LRESULT HandleMessages( HWND hWnd, UINT uMsg, WPARAM wParam, LPARAM lParam );
    static void WINAPI StaticOnD3D9LostDevice();
    static void WINAPI StaticOnD3D9DestroyDevice();

    static HRESULT WINAPI StaticOnD3D10CreateDevice( ID3D10Device* pd3dDevice );
    HRESULT OnRender10( D3DXCOLOR color, const D3DXMATRIX* pmView, const D3DXMATRIX* pmProj, const D3DXVECTOR3* pEyePt );
    static void WINAPI StaticOnD3D10DestroyDevice();

    D3DXVECTOR3 GetLightDirection()         { return m_vCurrentDir; };
    void        SetLightDirection( D3DXVECTOR3 vDir ) { m_vDefaultDir = m_vCurrentDir = vDir; };
    void        SetButtonMask( int nRotate = MOUSE_RIGHT_BUTTON ) { m_nRotateMask = nRotate; }

    float GetRadius()                 { return m_fRadius; };
    void  SetRadius( float fRadius )  { m_fRadius = fRadius; };

    bool  IsBeingDragged() { return m_ArcBall.IsBeingDragged(); };

protected:
    HRESULT UpdateLightDir();

    // D3D9 objects
    static IDirect3DDevice9* s_pd3d9Device;
    static ID3DXEffect* s_pD3D9Effect;
    static ID3DXMesh*   s_pD3D9Mesh;

    // D3D10 objects
    static ID3D10Device* s_pd3d10Device;
    static ID3D10Effect* s_pD3D10Effect;
    //TODO: add some sort of d3d10 mesh object here
    static ID3D10InputLayout* s_pVertexLayout;
    static ID3D10EffectTechnique* s_pRenderTech;
    static ID3D10EffectVectorVariable* g_pMaterialDiffuseColor;
    static ID3D10EffectVectorVariable* g_pLightDir;  
    static ID3D10EffectMatrixVariable* g_pmWorld;
    static ID3D10EffectMatrixVariable* g_pmWorldViewProjection; 

    D3DXMATRIXA16  m_mRot;
    D3DXMATRIXA16  m_mRotSnapshot;
    float          m_fRadius;
    int            m_nRotateMask;
    CD3DArcBall    m_ArcBall;
    D3DXVECTOR3    m_vDefaultDir;
    D3DXVECTOR3    m_vCurrentDir;
    D3DXMATRIX     m_mView;
};



#endif